What is meant by extinct animal?

A type of animal is extinct when there are no more of that animal left alive anywhere in the world.
It means that all the animals of that type have died, and that type of animal is now lost forever.
Extinct animals are animals that used to live, but no longer exist. For example a T-rex, it used to be alive, but today it is extinct.
Extinct animals are animals that used to live on earth but due to natural or man-made causes have all died out. The species is then called extinct. Extinction means totally gone from everywhere but you'll also see it written where an animal is extinct from a specific location. This is incorrect, the term for local extinction is extirpated.

That's true, but there is a little more to it. I will give a minimum amount: Most of the extinct animals were prehistoric. The reason why dinosaurs were wiped out is because of a meteor. Many other prehistoric species (plants, animals, etc) adapted to a change in environment and habitat so we consider the original form extinct. One of the reasons why animals today are going extinct is because of the loss of habitats, due to cutting down forests, and other man-made environmental changes.

Extinction is a natural process but humans are causing more extinctions at an increasing rate, far more than is natural.

Examples:Barbary Lion- Panthera Leo Leo

The Barbary lion was the largest lion of the species. Barbary lions had a large black mane that covered its belly and ran down its back and shoulders. Big male lions weighed in over 500 pounds and grew up to eleven feet long.

Dodo, dinosaurs, quagga, (although a breeding-back programme has recently commenced, through selective breeding of the southern Plains Zebras).

Also the Cape Lion,the American lion (which was the largest subspecies ever), The passenger pigon( flocks use to be in the millions darkening the evening skies)

Australian extinct species: This list includes the Thylacine (Tasmanian Tiger), Eastern Bettong, Eastern hare-wallaby, Tammar Wallaby, Toolache Wallaby, Pig-footed bandicoot, western barred bandicaoot, and many species of hopping-mouse.